 Many apartments were constructed as duplex residences with grand entry foyers; curved, freestanding stairways; and dramatic public rooms.Some of the designs, including that of the John D. Rockefeller, Jr. triplex at 740 Park Avenue, were palatial by even the considerable standards of the day.That triplex, of more than , "had, depending on who was counting, anywhere from twenty-three to thirty-seven rooms, the discrepancy caused by such questions as whether one included hallways and foyers the size of ballrooms, servants quarters, and the fourteen bathrooms".